پردیس کشاورزی و منابع طبیعی دانشگاه تهران Iranian Journal of animal Science 2008-4773 45 2 2014 07 23 Lactation curve modeling for milk production traits in Mahabadi goat breed Lactation curve modeling for milk production traits in Mahabadi goat breed 173 184 51820 10.22059/ijas.2014.51820 FA Abdollah Rezagholivand Lahroud MSc. Student, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran Mohammad Moradi Shahrebabak Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran 0000-0002-5255-609X Abbas Pakdel Associated Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran Journal Article 2013 10 14 In this research, in order to describe milk production traits lactation Mahabadi goat breed, seven statistical functions were fitted using 1665 milk production traits records and 833 body weight records. The milk production traits were milk yield, fat percent, fat yield, protein percent, protein yield, lactose percent and SNF percent. These records have been recorded on 123 goats during years of 2012-2013. Based on results, there was not considerable difference in curve fitting of milk production and its composition yield among used functions. However, Ali and Schaeffer and Narushin-Takma functions in fat and SNF percentage, and inverse polynomial and Gompertz functions in protein and lactose percentage had higher goodness of fit in comparison with other function. Average daily milk production, days to peak production, milk production in peak, lactation period, and milk persistency were estimated 1 kg, 22 days, 1.22 kg, 120 days, and 5.59, respectively. In this research, in order to describe milk production traits lactation Mahabadi goat breed, seven statistical functions were fitted using 1665 milk production traits records and 833 body weight records. The milk production traits were milk yield, fat percent, fat yield, protein percent, protein yield, lactose percent and SNF percent. These records have been recorded on 123 goats during years of 2012-2013. Based on results, there was not considerable difference in curve fitting of milk production and its composition yield among used functions. However, Ali and Schaeffer and Narushin-Takma functions in fat and SNF percentage, and inverse polynomial and Gompertz functions in protein and lactose percentage had higher goodness of fit in comparison with other function. Average daily milk production, days to peak production, milk production in peak, lactation period, and milk persistency were estimated 1 kg, 22 days, 1.22 kg, 120 days, and 5.59, respectively. https://ijas.ut.ac.ir/article_51820_4806ca25ba2a7821ec21f9077be4ae49.pdf